The CS-1575D is a 10 MHz‚ 2-channel oscilloscope capable of displaying waveform and phases simul-taneously. The frequency response is DC to 10 MHz (-3 dB)‚ the maximum sensitivity is 5 mV ±3% and the sweep rate is 0.5 s/div to 0.5 µs/div ±3%. During observation of 2 phenomena‚ the left/right display and the simultaneous Lissajous waveform display are possible in addition to the conventional up/down display. Other versatile waveform display features include the simultaneous display of the Lissajous waveform and 0(degree) phase waveform‚ the dual triggering function and the auto-freerun function. In the 2-channel mode, waveforms can be displayed and observed in a left/right display as well as in the conventional up/down display. In the 2-channel mode, the Lissajous waveform which is convenient for measuring the phase difference between two signals can be displayed together with the two signals. In the single-phenomenon and 2-channel modes, the trigger sources are selected automatically according to the waveforms. CH1 and CH2 use independent auto-freerun circuits so that a stable waveform can be displayed even when no signal is applied to the other input channel.